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Credit Quality of Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
With no related allowance recorded [Abstract]    
Recorded Investment $ 38,268 $ 28,796
Unpaid Principal Balance 42,969 29,137
Average Recorded Investment 33,532 29,323
Interest Income Recognized 61 104
With an allowance recorded [Abstract]    
Recorded Investment 14,575 33,742
Unpaid Principal Balance 15,708 33,850
Related Allowance 4,252 7,153
Average Recorded Investment 24,159 26,922
Interest Income Recognized 1 1
Totals [Abstract]    
Recorded Investment 52,843 62,538
Unpaid Principal Balance 58,677 62,987
Related Allowance 4,252 7,153
Average Recorded Investment 57,691 56,245
Interest Income Recognized 62 105
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 19,853 15,101
Unpaid Principal Balance 22,105 15,428
Average Recorded Investment 17,477 18,815
Interest Income Recognized 61 90
With an allowance recorded [Abstract]    
Recorded Investment 11,039 16,372
Unpaid Principal Balance 12,071 16,470
Related Allowance 3,254 4,369
Average Recorded Investment 13,706 10,781
Interest Income Recognized 1 1
Totals [Abstract]    
Related Allowance 3,254 4,369
Real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 2,366 9
Unpaid Principal Balance 2,366 9
Average Recorded Investment 1,188 23
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 50  
Unpaid Principal Balance 120  
Related Allowance 17  
Average Recorded Investment 25  
Interest Income Recognized 0  
Totals [Abstract]    
Related Allowance 17  
Real estate – commercial    
With no related allowance recorded [Abstract]    
Recorded Investment 15,371 12,710
Unpaid Principal Balance 17,820 12,710
Average Recorded Investment 14,040 9,297
Interest Income Recognized 0 14
With an allowance recorded [Abstract]    
Recorded Investment 2,761 15,979
Unpaid Principal Balance 2,761 15,979
Related Allowance 904 2,216
Average Recorded Investment 9,370 14,992
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 904 2,216
Real estate - residential    
With no related allowance recorded [Abstract]    
Recorded Investment 587 903
Unpaid Principal Balance 587 903
Average Recorded Investment 745 1,134
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 445 923
Unpaid Principal Balance 445 923
Related Allowance 7 260
Average Recorded Investment 684 730
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 7 260
Installment loans to individuals    
With no related allowance recorded [Abstract]    
Recorded Investment 91 73
Unpaid Principal Balance 91 87
Average Recorded Investment 82 54
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 247 468
Unpaid Principal Balance 278 478
Related Allowance 69 308
Average Recorded Investment 357 419
Interest Income Recognized 0 0
Totals [Abstract]    
Related Allowance 69 308
Finance leases    
With no related allowance recorded [Abstract]    
Recorded Investment 0  
Unpaid Principal Balance 0  
Average Recorded Investment 0  
Interest Income Recognized 0  
With an allowance recorded [Abstract]    
Recorded Investment 33  
Unpaid Principal Balance 33  
Related Allowance 1  
Average Recorded Investment 17  
Interest Income Recognized 0  
Totals [Abstract]    
Related Allowance 1  
Total: Commercial    
With an allowance recorded [Abstract]    
Related Allowance 4,159 6,585
Totals [Abstract]    
Recorded Investment 49,057 60,162
Unpaid Principal Balance 54,790 60,587
Related Allowance 4,159 6,585
Average Recorded Investment 54,610 53,885
Interest Income Recognized 62 105
Total: Construction    
With an allowance recorded [Abstract]    
Related Allowance 17 0
Totals [Abstract]    
Recorded Investment 2,416 9
Unpaid Principal Balance 2,486 9
Related Allowance 17 0
Average Recorded Investment 1,213 23
Interest Income Recognized 0 0
Total: Residential    
With an allowance recorded [Abstract]    
Related Allowance 7 260
Totals [Abstract]    
Recorded Investment 1,032 1,826
Unpaid Principal Balance 1,032 1,826
Related Allowance 7 260
Average Recorded Investment 1,429 1,864
Interest Income Recognized 0 0
Total: Consumer    
With an allowance recorded [Abstract]    
Related Allowance 69 308
Totals [Abstract]    
Recorded Investment 338 541
Unpaid Principal Balance 369 565
Related Allowance 69 308
Average Recorded Investment 439 473
Interest Income Recognized $ 0 $ 0